Been working on my 1975 280z this weekend. Did a fluid exchange on the brakes and clutch system. I also pulled my Nismo in for an oil change. Inspected the clutch fluid and found this. 23,000 miles and I have coffee in my clutch master cylinder reservoir. Take a look. Had to do a fluid exchange on this also. Ugg.
It did have some debris in the bottom of it. Used my master vac to vaccum out the old fluid. Cleaned with a paper towel and directed the paper towel in the cracks with a jewelers screw driver. Didn't need any of that crap going downstream.